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with a little added bonus
What a breath of fresh air after the incredible parsing in challenge #20
Used my own input file for the challenge
I did a lot of manual encoding first, then followed the number to month approach
One more down
Some of the past exercises help prepare for this one. Finished fairly quickly!
Challenge #21 solved. I had slightly different logic to produce the years and the months. I used LENGTH to find the starting points for each year.